Surface plasmon assisted hot electron collection in wafer-scale metallic-semiconductor photonic crystals

Jeffrey B. Chou, Xin Hao Li, Yu Wang, David P. Fenning, Asmaa Elfaer, Jaime Viegas, Mustapha Jouiad, Yang Shao-Horn, Sang Gook Kim

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Plasmon assisted photoelectric hot electron collection in a metal-semiconductor junction can allow for sub-bandgap optical to electrical energy conversion. Here we report hot electron collection by wafer-scale Au/TiO2 metallic-semiconductor photonic crystals (MSPhC), with a broadband photoresponse below the bandgap of TiO2. Multiple absorption modes supported by the 2D nano-cavity structure of the MSPhC extend the photon-metal interaction time and fulfill a broadband light absorption. The surface plasmon absorption mode provides access to enhanced electric field oscillation and hot electron generation at the interface between Au and TiO2. A broadband sub-bandgap photoresponse centered at 590 nm was achieved due to surface plasmon absorption. Gold nanorods were deposited on the surface of MSPhC to study localized surface plasmon (LSP) mode absorption and subsequent injection to the TiO2 catalyst at different wavelengths. Applications of these results could lead to low-cost and robust photo-electrochemical applications such as more efficient solar water splitting.

Original languageBritish English
Pages (from-to)A1234-A1244
JournalOptics Express
Issue number18
StatePublished - 5 Sep 2016


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